•They
are holes or depressions
in the river bed.•They
vary in size from a few centimetres to several
metres in diameter.

How
are Potholes formed?

•They
are formed by corrosion
in rivers where the fast-flowing
water swirls, especially if the river
bed is uneven.•Fragments
of stones and pebbles carried by the river whirl
around, drilling circular
depressions into the river bed.•The
flowing water keeps the fragments in motion, constantly wearing
away the sides
of the depressions.•These
gradually become deeper and wider
to become potholes.•Sometimes,
two potholes join
to create an even larger pothole.